diff --git a/tests/ci_build/Dockerfile.doc b/tests/ci_build/Dockerfile.doc
index a09adcba06ef..73f138139922 100644
--- a/tests/ci_build/Dockerfile.doc
+++ b/tests/ci_build/Dockerfile.doc
@@ -9,4 +9,4 @@ RUN wget http://downloads.lightbend.com/scala/2.11.8/scala-2.11.8.deb && \
     dpkg -i scala-2.11.8.deb && rm scala-2.11.8.deb
 
 RUN apt-get install -y doxygen libatlas-base-dev graphviz pandoc
-RUN pip install sphinx CommonMark==0.5.4 breathe mock recommonmark pypandoc
+RUN pip install sphinx==1.3.5 CommonMark==0.5.4 breathe mock recommonmark pypandoc